En matemáticas, se denomina logaritmo decimal, logaritmo común o logaritmo vulgar al logaritmo cuya base es 10, por lo tanto, es el exponente al cual hay que elevar 10 (exponenciación) para obtener dicho número. Se suele denotar como log10(x), o a veces como log(x), aunque esta última notación causa ambigüedades, ya que los matemáticos usan ese término para referirse al logaritmo complejo. El logaritmo decimal fue desarrollado por Henry Briggs.

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In mathematics, the common logarithm is the logarithm with base 10. It is also known as the decadic logarithm and also as the decimal logarithm, named after its base, or Briggsian logarithm, after Henry Briggs, an English mathematician who pioneered its use, as well as "standard logarithm". It is indicated by log10(x), or sometimes Log(x) with a capital L (however, this notation is ambiguous since it can also mean the complex natural logarithmic multi-valued function). On calculators it is usually "log", but mathematicians usually mean natural logarithm (logarithm with base e ≈ 2.71828) rather than common logarithm when they write "log". To mitigate this ambiguity the ISO 80000 specification recommends that log10(x) should be written lg (x) and loge(x) should be ln (x).

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